[llvm-bugs] [Bug 43224] New: gvn-hoist crashes with segmentation fault

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43224

            Bug ID: 43224
           Summary: gvn-hoist crashes with segmentation fault
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: cszide at 163.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 22473
  --> https://bugs.llvm.org/attachment.cgi?id=22473&action=edit
.bc file of the source code

clang -v
clang version 10.0.0 (trunk 371001)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/6.5.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/8
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/7.4.0
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64

$clang -O3 -c -emit-llvm  -femit-all-decls -mllvm -disable-llvm-optzns small.c

$opt -early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc
Stack dump:
0.      Program arguments:
/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt
-early-cse-memssa -die -gvn-hoist small.bc -o small-opt.bc 
1.      Running pass 'Function Pass Manager' on module 'small.bc'.
2.      Running pass 'Early GVN Hoisting of Expressions' on function '@d'
 #0 0x000055a336f21cfa llvm::sys::PrintStackTrace(llvm::raw_ostream&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x2742cfa)
 #1 0x000055a336f1f9d4 llvm::sys::RunSignalHandlers()
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x27409d4)
 #2 0x000055a336f1fb12 SignalHandler(int)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x2740b12)
 #3 0x00007f49a9045890 __restore_rt
(/lib/x86_64-linux-gnu/libpthread.so.0+0x12890)
 #4 0x000055a33678f3c0 llvm::BasicBlock::getModule() const
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x1fb03c0)
 #5 0x000055a336234309 llvm::MemoryLocation::get(llvm::LoadInst const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x1a55309)
 #6 0x000055a33623a053 llvm::MemoryLocation::getOrNone(llvm::Instruction
const*)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x1a5b053)
 #7 0x000055a33623df84
llvm::MemorySSAUtil::defClobbersUseOrDef(llvm::MemoryDef*, llvm::MemoryUseOrDef
const*, llvm::AAResults&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x1a5ef84)
 #8 0x000055a336c9b5be llvm::GVNHoist::hasEHOrLoadsOnPath(llvm::Instruction
const*, llvm::MemoryDef*, int&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24bc5be)
 #9 0x000055a336c9e90a
llvm::GVNHoist::findHoistableCandidates(llvm::DenseMap<llvm::BasicBlock*,
llvm::SmallVector<llvm::CHIArg, 2u>, llvm::DenseMapInfo<llvm::BasicBlock*>,
llvm::detail::DenseMapPair<llvm::BasicBlock*, llvm::SmallVector<llvm::CHIArg,
2u> > >&, llvm::GVNHoist::InsKind,
llvm::SmallVector<std::pair<llvm::BasicBlock*,
llvm::SmallVector<llvm::Instruction*, 4u> >, 4u>&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24bf90a)
#10 0x000055a336ca0a52
llvm::GVNHoist::computeInsertionPoints(llvm::DenseMap<std::pair<unsigned int,
unsigned int>, llvm::SmallVector<llvm::Instruction*, 4u>,
llvm::DenseMapInfo<std::pair<unsigned int, unsigned int> >,
llvm::detail::DenseMapPair<std::pair<unsigned int, unsigned int>,
llvm::SmallVector<llvm::Instruction*, 4u> > > const&,
llvm::SmallVector<std::pair<llvm::BasicBlock*,
llvm::SmallVector<llvm::Instruction*, 4u> >, 4u>&, llvm::GVNHoist::InsKind)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24c1a52)
#11 0x000055a336ca2458 llvm::GVNHoist::hoistExpressions(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24c3458)
#12 0x000055a336ca2a22 llvm::GVNHoist::run(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24c3a22)
#13 0x000055a336ca2f0a llvm::GVNHoistLegacyPass::runOnFunction(llvm::Function&)
(.part.597)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x24c3f0a)
#14 0x000055a3368793a9 llvm::FPPassManager::runOnFunction(llvm::Function&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x209a3a9)
#15 0x000055a3368794a1 llvm::FPPassManager::runOnModule(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x209a4a1)
#16 0x000055a336878601 llvm::legacy::PassManagerImpl::run(llvm::Module&)
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x2099601)
#17 0x000055a335065eff main
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x886eff)
#18 0x00007f49a7cdab97 __libc_start_main
/build/glibc-OTsEL5/glibc-2.27/csu/../csu/libc-start.c:344:0
#19 0x000055a3350dcf2a _start
(/home/jack-zhou/Documents/llvm/llvm_truck/llvm2/build7/bin/opt+0x8fdf2a)
Segmentation fault (core dumped)

------------------------------------------------
int *a;
void(b)();
long(c)();
int d() {
  int e;
  long f, g = 5;
  {
    int h, e = 0;
    f = c(e, 5);
    b(f);
    char i = g;
    {
      long j, m;
      int k, l = 0;
      if (0L < l)
        *a;
      else
        return 0;
    }
  }
  return 0;
}

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